Green Rice: In food processor fitted with chopping blade, combine cilantro leaves, onion, quartered, garlic, and 1/2 teaspoon salt; process until very finely chopped and well blended. In 3-quart saucepan, heat 3 tablespoons olive oil over medium heat. Add cilantro mixture and cook 5 minutes. Stir in rice and cook 1 minute. Add 4 cups hot water; heat to boiling over high heat. Reduce heat to low, cover, and cook 20 minutes or until rice is cooked through. (The cilantro will rise to the surface of the rice; simply stir it back in just before serving.)